I enjoyed trying to draw the eye, but I need to work on drawing eyelashes some more...
Good job! Some details skipped, but not bad for a guy who usually does space stuff. Maybe you could try doing planets and stars in the reflection?
Thanks for your comment! I also noticed that the pupil is slightly off centre and not a perfect sphere. Hopefully with more practice I'll get the hang of it.
Nice shape of eyes! You've got nice reflections on the iris and yes, I agree the lashes could be better: they're finer in real life. The lower lashes look better IMHO. The teardrop is a nice touch and I think you could have put a bit more shine on it. Otherwise, a really good drawing!